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Corrosion Behaviour of Fe-Based and Ni-Based Alloys in Wet CO2 Gas with and without Chloride Deposits at 750 °C.
- Source :
-
High Temperature Corrosion of Materials . Dec2023, Vol. 100 Issue 5/6, p655-682. 28p. - Publication Year :
- 2023
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Abstract
- Corrosion behaviours of Fe–25Cr, Fe–25Cr–2Mn–1Si, Fe–25Cr–20Ni, 310SS, Ni–25Cr, and Ni–25Cr–2Mn–1Si (all in wt%) with and without NaCl–KCl deposits in Ar–60%CO2–20%H2O gas at 750 °C were studied. Without salt deposits, Fe–25Cr performed protectively, while Fe–25Cr–20Ni and Ni–25Cr underwent breakaway oxidation with multilayered scales formed. Adding alloy elements Si + Mn increased the corrosion resistance of all alloys by forming additional Mn-rich oxides and silica. Surface deposits of NaCl–KCl accelerated corrosion, forming porous Fe-rich oxide nodules for Fe–25Cr and thick, porous scales and internal oxidation zones for all other alloys. The protective effect of Si + Mn alloying disappeared in the presence of chlorides. Limited intergranular carbides were observed for all alloys in the gas-only condition. The extent of carburisation increased with the presence of chloride deposits for all Fe-based alloys, but remained unchanged for Ni-based alloys. Corrosion of these alloys at 750 °C is compared with that at 650 °C. The effect of chlorides in volatilising metals at 750 °C is discussed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 27318397
- Volume :
- 100
- Issue :
- 5/6
- Database :
- Academic Search Index
- Journal :
- High Temperature Corrosion of Materials
- Publication Type :
- Academic Journal
- Accession number :
- 173893958
- Full Text :
- https://doi.org/10.1007/s11085-023-10192-0